// 根據(jù) XPath 獲取對(duì)象    
// 先根據(jù)Xpath獲得對(duì)象的Key，然后再根據(jù)Key獲取實(shí)際對(duì)象    
public virtual object GetItem(string xpath) {    

    object obj = null;    
    xpath = PrepareXPath(xpath);    
    XmlNode node = rootMap.SelectSingleNode(xpath);    

    if (node != null) {    
       // 獲取對(duì)象的Key    
       string key = node.Attributes["key"].Value;    

       // 獲取實(shí)際對(duì)象    
       obj = cacheStrategy.GetItem(key);    
    }    
    return obj;    
}    

// 獲取一組對(duì)象，此時(shí)xpath為一個(gè)組結(jié)點(diǎn)    
public virtual object[] GetList(string xpath) {    
    xpath = PrepareXPath(xpath);    

    XmlNode group = rootMap.SelectSingleNode(xpath);    

    // 獲取該結(jié)點(diǎn)下的所有子結(jié)點(diǎn)(使用[@key]確保子結(jié)點(diǎn)一定包含key屬性)    
    XmlNodeList results = group.SelectNodes(xpath + "/*[@key]");    

    ArrayList objects = new ArrayList();    

    string key;    

    foreach (XmlNode result in results) {    
       key = result.Attributes["key"].Value;    
       Object obj = cacheStrategy.GetItem(key);    
       objects.Add(obj);    
    }    

    return (object[])objects.ToArray(typeof(object));    
}

static void Main(string[] args) {    

    CacheService.Cache cache = CacheService.Cache.Instance;    

    // 添加對(duì)象到緩存中    
    cache.AddItem("/WebApplication/Users/Xin", "customer xin");    
    cache.AddItem("/WebApplication/Users/Jimmy", "customer jimmy");    
    cache.AddItem("/WebApplication/Users/Steve", "customer other");    
    cache.AddItem("/WebApplication/GlobalData", "1/1/2008");    
    cache.AddItem("/Version", "v10120080401");    
    cache.AddItem("/Site", "TraceFact.Net");    

    // 獲取所有User    
    object[] objects = cache.GetList("/WebApplication/Users");    
    foreach (object obj in objects) {    
       Console.WriteLine("Customer in cache: {0}", obj.ToString());     
    }    

    // 刪除所有WebApplication下所有子孫結(jié)點(diǎn)    
    cache.RemoveItem("/WebApplication");    

    // 獲取單個(gè)對(duì)象    
    string time = (string)cache.GetItem("/WebApplication/GlobalData");    
    string name = (string)cache.GetItem("/WebApplication/Users/Xin");    

    Console.WriteLine("Time: {0}", time);// 輸出為空，WebApplication下所有結(jié)點(diǎn)已刪除    
    Console.WriteLine("User: {0}", name);// 輸出為空, WebApplication下所有結(jié)點(diǎn)已刪除    

   
    // 獲取根目錄下所有葉結(jié)點(diǎn)    
    objects = cache.GetList("/");    
    foreach (object obj in objects) {    
       Console.WriteLine("Object: {0}", obj.ToString());    
    }    

    Console.ReadLine();    
}